Vaillant ecoMAX 646 Service Manual download pdf (Page 18)

Loosen screws on the 95 mm diameter

x 55mm wide clamp (6, fig. 21) and

push over the air duct.

Remove screws and sealing washer

on the 95 mm diameter x 25 mm

wide clamp (3, fig. 21) and push onto

the flue elbow on the side to be

connected to the appliance. Ensure

the clamp is clear of the end of the

elbow.

Push the flue elbow into the clamp (2,

fig. 20) connected to the appliance

flue gas duct and tighten the securing

screws lightly.

Ensure that the elbow and air/flue

duct line up and are closely butted

together. Pull the clamp (4, fig. 20)

over the joint between the flue gas

duct and flue elbow. Ensure that the

air/flue duct and terminal are correctly

positioned. Tighten the securing screws

on both clamps.

Note : Excessive tightening of these

screws is not necessary. Ensure that

the air / flue duct and terminal

assembly is not displaced though the

wall. Check that the air duct of the

terminal still projects by 90 mm

through the wall.

Refit the half ring 2, fig. 21. Pull the

95 mm diameter x 25 mm wide

clamp (3, fig. 21) over the joint

between the flue elbow and half rings.

Refit the screws and sealing washer

and tighten lightly.

Pull the 95 mm diameter x 55 mm

wide clamp (6, fig. 21) over the joint

between the flue elbow and air/flue

duct. Tighten the securing screws on

both clamps.

Drill two holes, 3 mm diameter

through both air duct clamps into the

air ducts at the most convenient

positions (5, fig. 21). Take care not to

penetrate the inner flue duct. Screw

the clamps to the air ducts using the

self tapping screws provided.

4.6.2 Vertical Flue

Remove the two half rings (2, fig. 18)

and, if necessary, fit the flue restrictor

ring.

(Note: It will be necessary to remove

both half rings if the flue restrictor ring

is to be fitted. The flue restrictor ring

should be placed on top of flue outlet

directly below the two half rings (see

fig. 18A). One half ring should be

replaced immediately).

Fit the 63 mm diameter x 68 mm wide

flue duct sleeve (2, fig. 22) over the

flue gas duct of the air/flue duct

assembly.

Loosen the screws of the 95 mm

diameter x 55 mm wide clamp (1, fig.

22) and push over the air duct of the

air/flue duct assembly.

Lower the flue assembly until a gap of

about 25 mm exists between the air

duct of the air/flue duct and terminal

assembly and the half rings on the

appliance. The two ducts must not butt

together.

Pull the sleeve (2, fig. 22) down over

the flue connection of the appliance

against the stop. Align the holes in the

sleeve and boiler flue gas connector

and secure with a self tapping screw

(1, fig.23).

Note : The sleeve must not be screwed

to the bottom of the flue gas duct of

the air/flue duct assembly. This duct

must be able to slide in order to

absorb small movements of the roof

structure.

Refit the two half rings. Pull the 95mm

diameter x 55 mm wide clamp down

over the joint between the air/flue duct

assembly and the half rings. Tighten

the clamp screws (1, fig.24).

18

fig. 21

fig. 20

GW 616/0

GW 594/0

fig. 22

GW 558/0

fig. 24

GW 602/0

fig. 23

GW 560/0

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